Dataset Direct Download Service (WFS): Map of the alump removal of clays on the commune of Mongausy (Gers)

The mapping of the hay removal of clays in the commune of Mongausy in the Gers department is extracted from the departmental mapping from the BRGM. This mapping is a zoning of the probability of occurrence of the phenomenon of shrink-inflating of clay soils. A susceptibility map was first drawn up on the basis of purely physical criteria by the BRGM from the geological maps of the department, which were interpreted taking into account the following factors for each geological formation:
— the proportion of clay material within the formation (lithic analysis);
— the proportion of blowing minerals in the clay phase (mineralogical composition);
— the geotechnical behavior of the material.
For each of the clay formations identified, the hazard level is ultimately the result of the level of susceptibility thus obtained with the density of sinister swelling, reported to 100 km² of actual urbanised outcropping surface.

本数据集提取自法国热尔省蒙戈西公社范围内的粘土胀缩现象测绘图，该图源自法国地质矿产调查局（BRGM）编制的省级地质测绘成果。该测绘图为粘土土壤收缩-膨胀（shrink-inflating）现象发生概率的分区图件。
法国地质矿产调查局（BRGM）首先基于纯物理判定准则，依托该省地质图编制了易发性图（susceptibility map）；在编绘过程中，针对每个地质构造，需综合考量以下三类因素：
- 地层内粘土物质的占比（岩相分析）；
- 粘土相中膨胀性矿物的占比（矿物组成分析）；
- 该物质的岩土工程特性。
针对每一处已识别的粘土地层，最终的灾害等级由前述得到的易发性等级结合灾害性胀缩密度确定，该密度以每100平方公里实际出露的城市化地表为统计基准。